Shouldn't it be 'win' and 'formerly' instead?

The sentence is a mess. If it is the quote of someone speaking in English, you cannot, of course, change it. If it is a translation, I couldn't help you because I don't know the original, and don't speak Malay. I'm not certain where you would put "win" and "formerly," so I will just re-write the sentence as I would write it. (Keep in mind that people who speak extemporaneously don't produce shining examples of their respective languages.)

Football used to be one of the sports at which Malaysia was strong and won consistently; now the country is being left behind.

Thanks, Setanta.